Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
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FLAP INSTEAD OF GLASSES
When working with a rotating cutting tool it is recommended to use special protective glasses. Their role can play a makeshift shield-the intake is made of metal strips and thin sheets of Plexiglas.
RETVIZAN
SQUADRON BATTLESHIP RETVIZAN. Scale model 1:200. "Retvizan" (in translation from the Swedish "war CRY") a Swedish ship of the line captured in battle on 26 June 1790. Preserved in...
